Simulation von Mauerwerk aus Kalksandsteinen unter Brandbeanspruchung

Simulation of calcium silicate masonry under fire load.

The contribution presents the development of a simulation model for the analysis of the behavior and resistance of fire-stressed calcium silicate masonry walls in the context of a european research project of the European Calcium Silicate Producer Association (ECSPA). Substantial elements of the coupled thermal-mechanical simulation model in finite elements the program system ANSYS are the thermal simulation of the time-dependent temperature distribution resulting from the fire load in the masonry wall as well as mechanical simulation with the help of a temperaturedependent nonlinear masonry material model for the prognosis of the deformations, stresses, cracking and resistance time caused by fire load. For the development process and the verification of the simulation model the optimization platform optiSLang with modern analysis strategies like sensitivity analysis and the system or parameter identification where used. By sensitivity analyses the important variables and physical phenomena of fire-Stressed calcium silicate masonry walls could be identified. Follow ing parameter identifications with efficient genetic and evolutionary optimization algorithms served the inverse determination of the temperature dependence of the relevant material parameters. With the help of the developed three-dimensional simulation model now it is possible to predict the fire resistance time and damage of fire-stressed calcium silicate masonry walls with high quality.